What is the vapour phase composition if the isothermal temperature is 87℃ and the mixture composition is 30%?

What is the vapour phase composition if the isothermal temperature is 87℃ and the mixture composition is 30%? Correct Answer 64% ethanol

In the given graph, we first select the point 0.3(30%) and move vertically upwards to intersect the isothermal line of 87℃. The we move along the isothermal line to the Dew Line and pin the intersection point, now move vertically down to the composition value which is the required answer = 0.64 = 64%.
Bissoy MCQ

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